Note 5 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

						Weighted-
				Weighted-		Average		Aggregate
				Average		Remaining		Intrinsic
	Number of			Exercise		Contractual		Value
	Options			Price		Term (yrs.)		(in thousands)
Outstanding at January 1, 2015		278,925		$	15.74
Granted		500			25.59
Exercised		(35,045	)		14.96
Forfeited or expired		-			-
Outstanding at September 30, 2015		244,380		$	15.87		3.36	$	2,726
Exercisable at September 30, 2015		230,381		$	15.65		3.24	$	2,622

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

						Weighted-
				Weighted-		Average		Aggregate
				Average		Remaining		Intrinsic
	Number of			Grant-Date		Contractual		Value
	RSUs			Fair Value		Term (yrs.)		(in thousands)
Outstanding at January 1, 2015		127,181		$	20.56
Granted		74,438			21.35
Converted		(41,138	)		17.21
Forfeited		(1,370	)		22.61
Outstanding at September 30, 2015		159,111		$	21.78		1.45	$	4,301
Vested and Convertible at September 30, 2015		-		$	-		-	$	-